BATTERYLESS CODE DIFFUSION TYPE MICROWAVE RADIO AUTHENTICATION CARD DEVICE OBTAINING TRANSMISSION ORDER BY PSEUDO RANDOM NUMBER AND USING FIXED DIFFUSION MODULATION CODE IN COMMON

摘要

PROBLEM TO BE SOLVED: To provide long-distance data transmission, removal of electromagnetic noise, and synergetic personal authentication numbers in combination between diffusion codes and the authentication numbers allocated according to the customers and the utilizations by providing a multiplex access control using pseudo random numbers and thereby capable of using spectrum diffusion modulation by the same diffusion codes in a batteryless code diffusion type microwave authentication card by converting minute microwave from the outside into an electric power and using it as a power supply.;SOLUTION: Each card is provided with a tuning detection circuit receiving unmodulated carrier wave from the outside, a power converting device converting the carrier wave into the electric power, an arithmetic device controlling the issue timing by generation of pseudo random numbers, a read-only memory capable of registering the preset authentication numbers and the diffusion codes, a primary modulation circuit modulating according to the identification number, and a secondary modulation circuit (diffusion modulation circuit) performing spectrum diffusion and modulation according to the diffusion codes.;COPYRIGHT: (C)2002,JPO